Narrow beech fern, also known as Phegopteris connectilis, can be described using a variety of synonyms to add descriptive variety to writing. Some possible alternatives include slender beech fern, delicate fern, feathery fern, needle-like fern, and fine-leaf fern. All of these synonyms convey a sense of delicacy and refinement, playing off the fern's slim and elegant appearance. Additionally, using synonyms can help to prevent repetition and add depth and nuance to descriptions of narrow beech fern, whether in scientific writing or creative prose.